Add PCH for JSystem (#2645)

src/JSystem/JUtility/JUTTexture.cpp

@@ -1,3 +1,5 @@
+#include "JSystem/JSystem.h" // IWYU pragma: keep
+
 #include "JSystem/JUtility/JUTTexture.h"
 #include "JSystem/JUtility/JUTPalette.h"
 #include "dolphin/gx.h"
@@ -185,4 +187,4 @@ void JUTTexture::load(_GXTexMapID param_0) {
         field_0x2c->load();
     }
     GXLoadTexObj(&mTexObj, param_0);
-}
+}